noun
A shop or studio where professional photographs are taken, such as for portraits, ceremonies, or formal occasions.
家族で写真館に行って、七五三の記念写真を撮った。
We went to a photo studio as a family and had commemorative photos taken for the Shichi-Go-San festival.
Compound of 写真 (photograph) and 館 (building, hall). The exact historical derivation is uncertain, but the term has been used since the early days of photography in Japan to refer to a dedicated photo studio.